题目

. The growing speed of a plant is influenced by a number of conditions, _______are beyond our control. A. most of them      B. most of which     C. most of what      D. most of that 答案：B如图所示的四种情景中，属于光的直线传播的是（ ）A．镜中的人像B．手影C．倒映在湖中的桥D．看上去水并不深